Phormiobius brouni, Shen & Choi & Leschen, 2020

Shen, Jia-Wei, Choi, Su-Ho & Leschen, Richard A. B., 2020, Revision of the New Zealand endemic genus Phormiobius (Coleoptera: Staphylinidae: Pselaphinae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 60 (2), pp. 553-564 : 557

Phormiobius brouni sp. nov.

( Figs 3 , 10 )

Type material. Hඈඅඈඍඒඉൾ: J, point-mounted ( NZAC), ‘Coll. A. E. Brookes. 10.Feb.1949. [in Brookes’ hand] // Aorere Valley, Bainham, W. Nelson [in Brookes’ hand] // A.E. Brookes Collection’.

Description. Body ( Fig. 3A ) length 2.41 mm, about 2.67× as long as wide (BL/AW = 2.67). Head about 1.24× longer than wide (HL/HW = 1.24). Pronotum about as long as wide (PL/PW = 1.02). Elytra wider than long, about 0.51× as long as wide (EL/EW = 0.51) and about 0.52× as long as pronotum (EL/PL = 0.52). Abdomen about 1.26× longer than wide (AL/AW = 1.26).

Male. Eyes with 14 facets. Abdominal concavities ( Figs 3B–C ) present on V1–V4; C1 polished and relatively deep, C2 deep and polished with edge conspicuously demarcated with side rims forming apical spines, greatest width bigger than length of metatrochanter and slightly widened posteriorly; C3 similar to C 2 in shape, and with apical spines more strongly projecting, greatest width slightly narrower than C1; C4 small and shallow with vaguely visible edges. Metatrochanter ( Fig. 3D ) with knot-shape tubercle; metatibia ( Fig. 3E ) with small apical spine. Tergite 5 about 1.25× wider than long, and broadly rounded.

Female. Unknown.

Differential diagnosis. This species can be easily distinguished from its congeners by males having four well-developed concavities on V1–V4, with spines on the rims of C2 and C3. Additional male characters that characterize this species are as follows: metatrochanter with a knot-shape tubercle and metatibia with a small apical spine.

Etymology. This species is dedicated to Thomas Broun honoring the centenary of his death (15 July 1838 – 24 August 1919) and his legacy naming the great majority of New Zealand beetle species; it is a noun in genitive singular.

Distribution. South Island: NN.

Figures

Fig. 3. Diagnostic characters of Phormiobius brouni sp. nov. A – habitus; B – abdomen, in ventrolateral view; C – same, in ventral view; D – metatrochanter; E – metatibia. Scale bars: A–C = 0.5 mm, D–E = 0.1 mm.

Fig. 10. Geographic distribution of Phormiobius brouni sp. nov., P. graceae sp. nov., P. halli Broun, 1917, P. matau sp. nov., P. pseudhalli sp. nov. and P. ramsayi sp. nov.